I claim a new ornamental design of a transportation seat side support, as shown and described.
FIG. 1 is a perspective view showing our new ornamental design of a transportation seat side support.
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof; and
FIG. 7 is a right side view thereof;
FIG. 8 is a sectional view along line 8-8 of FIG. 2; and,
FIG. 9 is a sectional view along line 9-9 of FIG. 2.
Dashed or otherwise broken lines are used for illustrative purposes only to give environmental context to the claimed design and do not form any part of the claimed design.